Stud or rivet.



is crimes.

EDWIN BALL STIMPSON, OF NEW YORK, N. Y'., ASSIGNOR TO EDWIN'B. STIMPSON COMPANY,

A CORPORATION OF NEW YORK.

STUD 0R RIVET.

No. 897,3 1e.

Specification of Letters Patent.

Patented Sept. 1, 1908.

Application filed December 11, 1906. Serial No. 347,265.

ments in studs or rivets, and more particu-' larly in that class of such devices which are adapted for use in connection with automobile tires for protecting the same against wear and injury from obstructions in the road and for preventing skidding, and the object of the invention is to provide a device-of this g'eneral character of a simple and comparatively inexpensive nature and of a strong and dura ble construction having improved means whereby the device is rendered capable of resisting wear without lessening its adaptability for application to the tire protector or other device for use.

' The invention consists in certain novel features of the construction, and combinations and arrangements of the several parts of the improved stud or rivet, whereby the same is rendered simpler, cheaper and otherwise better adapted and more convenient for use, all as will be hereinafter fullyset forth.

The novel features of the invention will be carefully defined in the claims.

In the accompanying drawings which serve to illustrate my invention Figure 1 is a sectional view taken axially through a stud or rivet embodying my improvements and showing the same set in position for use in the material of a tire protector or the like; Fig. '2 is a sectional view, showing the parts of the stud or rivet constructed according to my invention as they appear priorto being assembled and set in a the protector or other dev1ce; Fig. 3 1s a View show1ng,. 1n plan and edge elevation, the head or cover portion of the improved stud or rivet; Fig. 4 is a sectional view taken axially through a stud or rivet wherein my improvements are embodied in a modified form, and Fig. 5 is a view showing in plan a modified formation of the head of the stud or rivet also comprised in the present invention.

As shown in Figs. 1, 2 and 3, the improved stud or rivet comprises a body portion 1, produced from malleable or pliant metal and comprising a shank portion adapted to be passed through the material of the tire pro tector or other device in which thefstud or rivet is to be set for use in such fashion as to securely hold the said stud in place therein.

The said body portion also comprises a head or enlargement Zat the upper or outer end of said shank and made in cylindrical form of greater diameter than the shank, and provided with a recess or hollow produced in its upper surface, whereby said upper surface is made concave as shownat 3 and-produces, at its juncture with the cylindric sides of the head or enlargement an upwardly turned thin annular or edge portion having an acute angle in cross section as shown at '3 in the drawings. The improved stud or rivet constructed according to my inven,

tion also comprises a cap or cover member 4,- of shell like nature, which is formed from hardened steel or other resisting material and is designed to be applied over the softer malleable head 2 -ofthe body portion 1 in such manner as toinclose the same to protect it against wear and also to afford secure contact upon the roadway to prevent skidding. As shown in Figs. 1, 2 and 3, the said shell-like-cap or cover 4- has a flattened or plane top or outer surface 5 to impinge upon the roadway, and is provided with a central aperture 6 whereby additional tractive capacity is gained, and the side-walls 7, of said cap are bent or turned inwardly toward their lower or inner edgeportions, so as to meet the circumference of the flattened or plane surfaced outer end'5 at an acute angle as shown at 8, the said acute angle thus produced being adapted, when the device is set in a tire protector, to sink in the roadway to a much greater extent than would a right-angled en- 'gaging'surface, whereby increased tractive and anti-skidding effect is attained.

It will therefore be apparent that the shell-like cap or cover member 4 is given the form of a conic frustirm, and. since the metal of which it is formed is of substantially equal thickness throughout, -'it will be apparent that the interior cavity or hollow J'of said cap or cover member will also have the form of. a conic frustum, its wider part being immediately beneath the flattened outer face 5, while its narrower neck portion is at the ilpner or lower end of the cap or cover mem- In the manufacture of. the improved stud.

or rivet, the head or enlargement 2 ofthe soft or malleable body portion 1 will be made in a diameter adapting it to be snugly entered within the contracted neck portion of said hollow or cavity 9 of .the cap or cover member, and when the said head-or enlargement 2 is so applied Within said cavity or hollow 9, -tl1e annular raised edge portion or fin 3* s'urrounding the to surface of said head 2 mil contact upont e under or inner *surface' of the top ,5 of the cap or cover 'memb'er 4, so that when pressureis ';to' the parts, as by a blow; for exam. .15 I

' ment 2 Will and thereby closely fill the larger upper or f to the malleable'body portion;

tire covering or other device, after the applied P malleable nature. of the head or'enlargepermit it to expand laterally outer partof the cavity or hollow 9 of the cap or cover member as shown in'Fig. '1 so as to afioi'd vas ect ire connection of the same As .shown h ereii1 he. shank I portion 1 1s nade'm cyhndrlcal form so as -to be adapted to be assed through a sheet the y of the body df material 10, whic .maybe ai -protective fashion of a rivet and the inner projecting end or extremity oi said shank may'the'reafter be upset or. riveted as shown at 11 in a well known way for holding the device in place.

the shank. efore the-riveting operation. The particular formation of the sa d shank A washer or gasket 12 is herein shown as ap lied over the said inner end of is, however, immaterialto thepreSe'nt invention.

. In Fig. 4 I have shown a modified formation of the improved stud or rivet-wherein the top surface 5= of the cap'or cover member is made recessed or hollowed atits central part so as to have a concave form, whereby the acute nature or the circumferential engaging surface or edge 8 is made -more ronounced to enable it to sink deeper- 7 into t 1e roadway for increased tracti've and anti-skidding eif'ect. i

.In Fig. '5 l have shown stilh'another modified-formation of the device wherein the cap or cover member this a polygonal formation, the angles thereby produced in the edge 7 surface 8 affording additional trac'tive and anti-skidding capacity.

Having. thus described my invention, I claim A stud for the purpose specified, having H. G. Hosn. 

